Pre vs post-OBBBA issuance — the rule that follows the issuance date

The cutover date

OBBBA was signed on 2025-07-04. The §1202 amendments in P.L. 119-21 §70431 apply to QSBS issued after that date. Stock issued at any point through 2025-07-04 inclusive is pre-OBBBA stock — it gets the binary 5-year rule under §1202(a)(4), the $10M fixed cap under §1202(b)(1)(A), the $50M gross-asset ceiling under §1202(d)(1), and the original §1202(b) basis-cap arithmetic.

The statutory text uses "after the date of enactment." The IRS's longstanding convention for "after [date]" effective-date language is to exclude the date itself and include the next calendar day. Stock issued at 11:59 PM ET on 2025-07-04 is pre-OBBBA; stock issued at 12:00 AM ET on 2025-07-05 is post-OBBBA. The boundary is calendar-day, not transaction-time. The OBBBA cutover overview summarises this and the three substantive dimensions OBBBA changed.

Side-by-side comparison

Why issuance, not sale

Congress wrote the effective-date language to apply to stock issued after the enactment date. This protects pre-OBBBA holders — anyone who held QSBS before the bill was signed keeps their original framework — and lets the new structure phase in cleanly for fresh issuance. The drafting choice avoids the retroactive-tax-policy problem of suddenly tightening rules on stock people had already issued and held under the prior expectations.

Practically, a founder who took post-OBBBA shares on 2025-09-01 will hit the new 3-year tier on 2028-09-01. The same founder who took pre-OBBBA shares on 2025-06-15 will still wait until 2030-06-15 for any exclusion at all — but the eventual exclusion is 100% at the binary 5-year mark. The choice is between earlier partial exclusion (post-OBBBA) and later full exclusion (pre-OBBBA), with all the cap and rate details flowing from which rule set governs.

The six-step decision tree

1. Identify the issuance date.Pull the stock-purchase agreement or §83(b) election copy. For founder shares, it's the incorporation issuance date. For employee options, it's the exercise date if §83(b) was filed, otherwise the vesting/settlement date. For RSUs, it's settlement (vesting) date.
2. Compare to 2025-07-04.≤ 2025-07-04 → pre-OBBBA. > 2025-07-04 → post-OBBBA.
3. Check for §1202(h) tacking events. §351 contribution, §368(a)(1)(E) recap, §368(a)(1)(F) reincorporation, §1041 spousal transfer, gift, or inheritance. Each of these preserves the original issuance date and rule set. An S-to-C conversion does NOT tack — see §1202(h)(4).
4. Verify §1202(d)(1) gross-asset ceiling at issuance.$50M pre-OBBBA, $75M post-OBBBA. The ceiling is tested at issuance and at all times before the issuance through any 80%-active-business period. Retain the issuer's balance sheet at issuance.
5. Apply the rule set. Pre-OBBBA: binary 5-year, $10M or 10x basis, no tier. Post-OBBBA: 3/4/5 tier, $15M or 10x basis, 28% rate on unexcluded slice. See the 5-year holding period pillar for tier mechanics and the cap pillar for the in-cap vs over-cap split.
6. Apply the state-conformity overlay. Federal §1202 treatment is half the picture. California decouples;PA partially decouples; many others conform. See the 50-state grid.

Mixed portfolios — the most common case

Many founders, employees, and angels hold both pre-OBBBA and post-OBBBA stock — most often through replacement-grant cycles or follow-on issuance rounds. The decoder evaluates each issuance against its own rule set, then aggregates. Exit- timing planning should treat the two pools separately: a 5+ year hold on pre-OBBBA shares is mandatory for any exclusion, but a 4-year hold on post-OBBBA shares already gets you 75%. Run the mix in the decoder to see the per-lot and portfolio aggregate.

Mixed portfolio — worked example

Angel A holds three lots in Acme Inc.:

• Lot α — issued 2024-08-01 (pre-OBBBA), $500k basis, 200k shares.
• Lot β — issued 2025-12-15 (post-OBBBA, primary round), $1M basis, 400k shares.
• Lot γ — issued 2027-03-01 (post-OBBBA, follow-on), $300k basis, 120k shares.

A sells the full position on 2030-04-01:

• Lot α hold = (2030-04-01 − 2024-08-01) / 365.25 ≈ 5.67y → pre-OBBBA, 100% tier. Cap = max($10M, 10 × $500k = $5M) = $10M.
• Lot β hold = (2030-04-01 − 2025-12-15) / 365.25 ≈ 4.30y → post-OBBBA, 4-year tier (75%). Cap = max($15M, 10 × $1M = $10M) = $15M.
• Lot γ hold = (2030-04-01 − 2027-03-01) / 365.25 ≈ 3.08y → post-OBBBA, 3-year tier (50%). Cap = max($15M, 10 × $300k = $3M) = $15M.

Each lot computes its own per-rule-set cap and tier. Realized gain on each lot is split into in-cap and over-cap slices; the in-cap slice gets the tier exclusion at the §1202(a) 28% residual rate on the unexcluded portion; the over-cap slice is ordinary LTCG (20% + NIIT) under §1202(b)(1). The portfolio aggregate is the sum.

Edge cases the rule set decides

• Issuance on 2025-07-04 exactly:pre-OBBBA. The amendments apply "after" the date per P.L. 119-21 §70431.
• Stock split or recapitalization on pre-OBBBA shares: §1202(h)(1) tacking preserves the original issuance date. A 2026-04-01 stock split on stock issued 2024-08-01 remains pre-OBBBA. The split itself is not a new issuance for §1202 purposes.
• §368(a)(1)(F) Delaware-flip: pure F-reorganization preserves issuance date and §1202 status. Mixed F-reorg-plus-new-investor rounds create two QSBS pools: the converted lot keeps its original issuance date; new-investor shares have their own.
• §1045 replacement QSBS:the rule set follows the replacement stock's own issuance date, not the original. Roll into post-OBBBA replacement and you get the post-OBBBA rule set going forward — even if the original was pre-OBBBA. The §1045 holding period tacks under §1045(b)(4) (routing through §1223 via §1045(b)(5)) for the §1202 5-year test, but the rule-set parameters (cap, tier, ceiling) come from the replacement's issuance date. See the §1045 pillar.
• §351 contribution to a holdco: §1202(h)(1)(A) tacking preserves the original §1202 status, basis, and issuance date for the contributed shares. The holdco stock is treated as QSBS to the extent of the contributed QSBS basis. Post-§351 issuance of new holdco stock to outside investors creates a separate QSBS lot with its own issuance date.
• S-corp to C-corp conversion: §1202(h)(4) does not tack. The C-corp incorporation date is the §1202 clock-start AND the OBBBA-determining date for every share that existed pre-conversion. An S-corp that converts on 2025-08-15 produces post-OBBBA QSBS at that conversion-issuance.
• Secondary purchase from another shareholder: §1202(c)(1) requires original issuance from the corporation. A secondary purchase fails the original- issuance test and is not QSBS regardless of when the original issuance occurred. The rule set is moot.

Common-mistake ladder

• Mistake 1: using the sale date to pick the rule set. The OBBBA amendments turn on issuance, not sale. A 2031 sale of 2024-08-01-issued stock is still pre-OBBBA.
• Mistake 2: treating §1202(h) tacking as a new-issuance reset. A §351 contribution or §368(a)(1)(F) Delaware flip preserves the original date. Practitioners sometimes treat a Delaware-flip as a 2025-12 issuance and accidentally move pre-OBBBA stock into the post-OBBBA bucket.
• Mistake 3: forgetting that §1202(h)(4) does NOT tack across S-to-C. The reverse error: treating S-corp tenure as part of the §1202 hold. The C-corp issuance starts a fresh §1202 clock.
• Mistake 4: ignoring redemption disqualification.Treas. Reg. §1.1202-2's 4-year window centered on issuance applies regardless of rule set. A buyback during that window can silently disqualify QSBS status.
• Mistake 5: misreading "after 2025-07-04" as "on or after." The IRS convention excludes the date itself when statute says "after." 2025-07-04 is pre-OBBBA; 2025-07-05 is post-OBBBA.

Documentation to retain

The rule-set determination depends on the issuance date, which depends on documentary evidence:

• Stock-purchase / subscription agreement showing the issuance date.
• §83(b) election copy with IRS-stamped receipt for early-exercise shares — establishes the exercise date as the §1202 issuance date.
• Cap-table snapshot at issuance showing share count and class.
• Issuer balance sheet at issuance proving the §1202(d)(1) gross- asset ceiling test ($50M / $75M depending on rule set).
• §351 / §368 reorganization documents if tacking applies — board resolutions, plan of reorganization, exchange documentation.
• Annual §1202(e) active-business attestation covering substantially all of the hold period.

The Form 8949 walkthrough covers the filing-side mechanics; the methodology page documents how the decoder derives the rule set from the issuance-date input.

State conformity bridge

OBBBA changed federal §1202 but did NOT change state-level treatment. The same decoupling / partial / full / no-tax pattern that applied pre-OBBBA continues:

• California:full decoupling under Cal. Rev. & Tax. Code §17131 — regardless of pre or post-OBBBA federal treatment, CA taxes the full QSBS gain at up to 13.3%.
• Pennsylvania: partial conformity at 3.07% flat — federal exclusion does not flow through.
• New Jersey: partial decoupling on NJ-1040 Schedule B.
• Texas and no-tax states: federal exclusion is the full picture.

States may revise their conformity in response to OBBBA — annual review is needed. The 50-state grid tracks current positions with a lastVerified date per state.

Informational, not tax advice. Consult a CPA or Enrolled Agent before acting on a corrective distribution.